Count the # of time the instr excutes in 1 sec.

Dear all,
I am currently working on part of a sweeping carrier program and now I need to determine the # of samples generated in 1sec. I tried to connect a 1 sec elapsed timer to the loop condition of the while loop and also a indicator to monitor the n value of the count. The result I obtained is quite low (about 35377 samples/sec). I need more than 781250sample/sec as I need to feed into my AWG hardware later.
To basically monitor the # of sample generate per sec, I wonder if I had connect the timer and the indicator correctly. If my program in deep can only generate 35377 sample/sec, please advice me how I can modify my program to generate more that 781250 sample / sec.
I have attached my program as below.
For you info, I am using the following sets of parameter:
Sweep rate = 50
Upper limit of span = 200
Lower limit of span = -200
start frequency = 0
Thanks alot and please help.
Zhi Hong
Message Edited by Zhi Hong on 07-16-2008 10:42 PM
Attachments:
Sweep rate and Span 52.vi ‏97 KB

I ran this on a fairly old machine and got about 8800 iterations.
I would recommend that you rewrite your VI so that the values are calculated using LabVIEW primitive math functions rather than using the Formula node. I believe the Formula node is probably an order of magnitude slower.
You can probably simplify the code a bit. The only difference between left and right cases is the choice of either addition or subtraction in the first line. You could merge the two cases. Just carry a boolean, or an integer of +1 or -1 in a shift register that you can multiply to the second half of that formula and add to the first half.
Also, if you can figure out how many samples you will be generating ahead of time, initialize an array of at least that large and use replace array subset in the loop rather than autoindexing at the tunnel. This may save processor time as the arrays grow and are moved around in memory at the auto indexing tunnels.
Are these calculations that have to be done on a continual basis to feed the waveform generator? Or will they be done once at the beginning, or occasionally during operation? Is it really critical that hundreds of thousands of elements of an array are generated in less than a second?
Message Edited by Ravens Fan on 07-17-2008 12:25 AM

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Count the # of time the instr excutes in 1 sec.

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